Lookup in Power BI using DAX

Question

Hi All,I have a scenario where I have two table.Table A: Users and Access fieldTable B: Users and AuthVariableNow the logic is , for the user in Table B, look for the "AuthVariable" value. If the value is "Z1" , then look for the "Access" field in Table A and assign the user with all the "Access" values which start with "1"(eg: 11,15 form Table A).If the value is "Zall", assign all the "Access" values to that user (eg: 11,28,15,55,63,64,41,36), and if the value is "Z5", assign all the "Access" values from Table A which starts with 5(55) against that user.&nbsp;These values can be appended to Table A or create a new table Table C.&nbsp;Could you please help with a approach.&nbsp;ThanksPoojitha&nbsp;&nbsp;&nbsp;

greg_deckler · Accepted Answer

Thanks&nbsp;Anonymous , this was fun.
&nbsp;
TableC = 
    VAR __AccessCodes = DISTINCT('TableA'[Access])
    VAR __TableB = 'TableB'
    VAR __TableA = 'TableA'
    VAR __Table = GENERATE(FILTER(__TableB,[AuthVariable]&lt;&gt;"Zall"),__AccessCodes)
    VAR __TableZall = GENERATE(FILTER(__TableB,[AuthVariable]=="Zall"),__AccessCodes)
    VAR __TableZallFinal = SELECTCOLUMNS(__TableZall,"User",[User],"Access",[Access])
    VAR __TableFinal = 
        SELECTCOLUMNS(
            FILTER(
                ADDCOLUMNS(
                    __Table,
                    "__AuthVariable",RIGHT([AuthVariable],1),
                    "__Access",LEFT([Access],1)
                ),
                [__Access] = [__AuthVariable]
            ),
            "User",[User],
            "Access",[Access]
        )
RETURN
    UNION(__TableA, __TableFinal, __TableZallFinal)

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Lookup in Power BI using DAX

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